On the "Maternal Lineage Test" results page, there's a table with rows: LOCATION, REFERENCE, and your name. The values to enter at MitoSearch are your corresponding value at each location.
For example, among my results are location 16519, reference T, and my value C. So I would enter 16519 C at MitoSearch. I also happen to have an insertion after 315. They already conveniently labeled it 315.1, which are entered separately on MitoSearch: 315 .1 C
HVR1 is the range 16001-16569 (the entry textboxes already have 16 before them, so you only need to enter the last 3 digits). HVR 2 is 1-576.